(responding to the 2020-02-21 0759pm mountain time post by Louis)

(Ed earlier said)
> I asked about that number since some folks are skittish
> about revealing their actual IP addresses.

Ed knows me well!

I'm not sure which of all them sequences "ip add show" displays Louis is referring to, so here's the output, with digits after the first 2 groups of each sequence replaced with n's in most cases:

-bash.1[~]: ip add show
1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN group default qlen 1000
    link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
    inet 127.0.0.1/8 scope host lo
       valid_lft forever preferred_lft forever
    inet6 ::1/128 scope host
       valid_lft forever preferred_lft forever
2: eno1: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc fq_codel state UP group default qlen 1000
    link/ether 30:85:nn:nn:nn:nn brd ff:ff:ff:ff:ff:ff
    inet 67.172.nnn.nn/nn brd 67.172.nnn.nnn scope global dynamic noprefixroute eno1
       valid_lft 174956sec preferred_lft 174956sec
    inet6 2001:558:nnnn:nn:nnnn:nnnn:nnnn:nnn/nnn scope global dynamic noprefixroute
       valid_lft 318456sec preferred_lft 318456sec
    inet6 fe80::nnnn:nnnn:nnnn:nnnn/nn scope link noprefixroute
       valid_lft forever preferred_lft forever
3: virbr0: <NO-CARRIER,BROADCAST,MULTICAST,UP> mtu 1500 qdisc noqueue state DOWN group default qlen 1000
    link/ether 52:54:nn:nn:nn:nn brd ff:ff:ff:ff:ff:ff
    inet 192.168.nnn.n/nn brd 192.168.nnn.nnn scope global virbr0
       valid_lft forever preferred_lft forever
4: virbr0-nic: <BROADCAST,MULTICAST> mtu 1500 qdisc fq_codel master virbr0 state DOWN group default qlen 1000
    link/ether 52:54:nn:nn:nn:nn brd ff:ff:ff:ff:ff:ff
-bash.2[~]:

I see "192.168.", but no "10." and no "172.16.".  Does that mean it is an RFC1918, and that the modem does do NAT and the firewall?  Am I understanding Louis correctly?  What's the practical significance of this?
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